Pd(II)-Catalyzed Arylation and Intramolecular Amidation of γ-C(sp<sup>3</sup>)–H Bonds: En Route to Arylheteroarylmethane and Pyrrolidone Ring Annulated Furan/Thiophene Scaffolds
作者:Ramarao Parella、Srinivasarao Arulananda Babu
DOI:10.1021/acs.joc.7b00582
日期:2017.7.21
(1a–e) were derived from their corresponding carboxylic acids and bidentate directing groups. These compounds were then used as substrates to investigate the arylation and successive arylation/intramolecular amidation of the γ-C(sp3)–H bonds. The γ-C(sp3)–H arylation arose from the Pd(II)-catalyzed reactions of these compounds with aryl iodides with reaction periods of 4–24 h (except a few reactions
我们报告了Pd(II)催化的,双齿指导基团(BDG)辅助的芳基化和连续的芳基化/γ-C(sp 3)–H键的芳基化。Pd(II)催化的BDG辅助羧酸的C–H活化和功能化,羧酸的β-C(sp 3)–H键,但是仅有少数报道涉及BDG指导的功能化-C(sp 3)–H键的数量。各种3-甲基噻吩/呋喃-2-羧酰胺(1a – e)衍生自其相应的羧酸和二齿导向基团。然后将这些化合物用作底物以研究γ-C(sp 3)– H键。γ-C(sp 3)-H芳基化反应是由这些化合物与芳基碘化物在Pd(II)催化下反应的,反应时间为4-24小时(少数反应需要36或48小时)。值得注意的是,这些反应导致了各种非对称二芳基甲烷的支架,例如噻吩/呋喃类arylheteroarylmethanes(建设3 - 6)。将反应时间延长至48–70 h会导致连续的γ-C(sp 3)–H芳基化/分子内酰胺化,以及C–C和C–N键的构